I can't agree about this whole handicapped thing and the stall. This woman could have been a lot more handicapped physically than she appeared to be and really did need this stall, so I wish people would think before speaking this way. Go through a list of disabilities and you might realize why she was in a handicapped stall. As for calling the dog a nasty dirty dog, this person might be phobic about dogs and was even too scared to wash her hands. Most of us carry those hand sanitizers in our purses anyway, you don't know that she didn't use one of those.
This person also paid for her ticket to the movies, so she has a right to complain if she wants to, whether she saw the vest or not. No one knows why or what was said if she complained. Let's not get ahead of ourselves and jump on the bandwagon before knowing if maybe she had a worse disability and chose not to use a dog.
On a side note, Sheena isn't a registered SD if I read right, maybe the woman was aware of this. So far only guide dogs have access.